15 Actionbar的显示和隐藏

ActionBar

• 显示隐藏方法：

  • 在布局文件中设置 theme主题

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.qf.day15_actionbar_demo1"
        android:versionCode="1"
        android:versionName="1.0" >
    
        <uses-sdk
            android:minSdkVersion="11"
            android:targetSdkVersion="18" />
    
        <!--
        换主题  换不同的action样式
        android:theme="@style/AppTheme"
             android:theme="@android:style/Theme.Light" 
             android:theme="@android:style/Theme.Holo"
               android:theme="@android:style/Theme.Holo.Light"
                 android:theme="@android:style/Theme.Holo.NoActionBar"
        -->
        <application
            android:allowBackup="true"
            android:icon="@drawable/ic_launcher"
            android:label="@string/app_name"
            android:theme="@style/AppTheme"
    
             >
            <activity
    
                android:name="com.qf.day15_actionbar_demo1.MainActivity"
                android:label="@string/app_name" 
                android:uiOptions="splitActionBarWhenNarrow"
                >
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </application>
    
    </manifest>

  • 逻辑代码中

    package com.qf.day15_actionbar_demo1;
    
    import android.annotation.SuppressLint;
    import android.app.ActionBar;
    import android.app.Activity;
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.View;
    import android.view.Window;
    import android.widget.TextView;
    
    public class MainActivity extends Activity {
    
        private ActionBar actionBar;
    
        private TextView tv;
    
        private int tvSize = 10;
        @SuppressLint("NewApi")
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            //方法控制没有标题栏 // 要在setContent之前设置否则直接奔溃 
            //requestWindowFeature(Window.FEATURE_NO_TITLE);
    
            //显示
    //      requestWindowFeature(Window.FEATURE_ACTION_BAR);
            setContentView(R.layout.activity_main);
    
            tv = (TextView) findViewById(R.id.tv);
    
            //获取当前ActionBar
            actionBar = getActionBar();
    
            //应用图标是否能点击    带一个向左的箭头 监听的ID是android.R.id.home
            actionBar.setDisplayHomeAsUpEnabled(true);
            //应用图标是否能点击  不带箭头
            //actionBar.setHomeButtonEnabled(true);
    
            //是否显示应用程序图标
            actionBar.setDisplayShowHomeEnabled(true);
        }
    
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.main, menu);
            return true;
        }
    
    
        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            switch (item.getItemId()) {
            case android.R.id.home://应用程序图标的id
    
                finish();
    
                break;
            case R.id.action_add:
                tvSize+=10;
                tv.setTextSize(tvSize);
                break;
            case R.id.action_call:
                tv.setText("拨打电话中....");
                break;
            case R.id.action_camera:
                tv.append("\n"+"美颜拍照");
                break;
            case R.id.action_delete:
                tv.setText("");
                break;
    
            default:
                break;
            }
            return super.onOptionsItemSelected(item);
        }
    
    
        public void MyClick(View v){
            //判断actionBar是否正在展示  
            if(actionBar.isShowing()){
                actionBar.hide();//隐藏
            }else{
                actionBar.show();//显示
            }
        }
    
    }